title: High power narrow-band fiber-based ASE source.
abstract: In this paper we describe a high power narrow-band amplified spontaneous emission (ASE) light source at 1030 nm center wavelength generated in an Yb-doped fiber-based experimental setup. By cutting a small region out of a broadband ASE spectrum using two fiber Bragg gratings a strongly constrained bandwidth of 12±2 pm (3.5±0.6 GHz) is formed. A two-stage high power fiber amplifier system is used to boost the output power up to 697 W with a measured beam quality of M2≤1.34. In an additional experiment we demonstrate a stimulated Brillouin scattering (SBS) suppression of at least 17 dB (theoretically predicted ~20 dB), which is only limited by the dynamic range of the measurement and not by the onset of SBS when using the described light source. The presented narrow-band ASE source could be of great interest for brightness scaling applications by beam combination, where SBS is known as a limiting factor.
authors.affiliation: Fraunhofer Institute for Applied Optics and Precision Engineering, Jena, Germany. oliver.schmidt@iof.fraunhofer.de
authors.forename: O
authors.initials: O
authors.lastname: Schmidt
authors.forename: M
authors.initials: M
authors.lastname: Rekas
authors.forename: C
authors.initials: C
authors.lastname: Wirth
authors.forename: J
authors.initials: J
authors.lastname: Rothhardt
authors.forename: S
authors.initials: S
authors.lastname: Rhein
authors.forename: A
authors.initials: A
authors.lastname: Kliner
authors.forename: M
authors.initials: M
authors.lastname: Strecker
authors.forename: T
authors.initials: T
authors.lastname: Schreiber
authors.forename: J
authors.initials: J
authors.lastname: Limpert
authors.forename: R
authors.initials: R
authors.lastname: Eberhardt
authors.forename: A
authors.initials: A
authors.lastname: Tünnermann
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007834:Lasers; D012031:Refractometry / Q000295:instrumentation*